Fuel supply apparatus for internal combustion engines



c. F. L. KING. FUEL SUPPLY APPARATUS FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JUNE 5 1M8 Puicntul UM". 28,1918.

2 SHEETS-SHEET I.

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-FUEL SUPPLY APPARATUS FOR INTERNAL COMBUSTION ENGiNES. APPLICATION FILED JUNE 5. 1918.

2 SHEETS-SHEET 2- CHARLES E. L. KIN G, OF EDGBARTON, BIRMINGHAM, ENGLAND.

FUEL-SUPPLY APPARATUS FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented Got. 28, 181141.

Application filed June 5, 1918. Serial No. 238,370.

To all whom it may concern:

Be it known that 1, CHARLES F REDERlCK LAWRENCE KING, a subject of the King of Great Britain, residing at 138 Bristol road, Edgbarton, Birmingham, England, have invented certain new and useful Improvements in Fuel-Supply Apparatus for Internal-Combustion Engines, of which the following is a specification.

- This invention relates to fuel supply apparatus for internal combustion engines of motor vehicles and the like said apparatus being of that type in which a low level upply tank is employed from which liquid uel is raised by suction into an auxiliary receptacle from which it flows by gravity to the carburetor; the suction and air valves of the receptacle being controlled by a rising and falling float, said valves usually being attachedtto a lever operated by the float.

The principal object of the present invention is to provide an improved and simplified form of valve mechanism.

According to the said invention the suction valve, being connected to or carried by a member operated by the rising and falling float, is adapted to be retained on its seating dur' 1g the emptying of the receptacle, solely by atmospheric pressure, but is adapted to be positively opened by the descent of the float on the fuel falling to a predetermined level. An idle or lost motion is provided for between the float and the memher that carries the suction valve.

Preferably the suction valve comprises a diskor plate of larger diameter than the aperture leading to the suction pipe, and a part of smaller diameter which enters the said aperture in order partially to interrupt the suction, in advance of the part of larger diameter closing on to its seating. A cylindrical air valve is employed working in a cylindrical chamber and arranged only to open the air aperture when the suction valve is closed. v

Figure 1 of the accompanying drawings is a vertical section through a fuel-feed apparatus constructed in accordance with this invention, the suction valve being shown open and the air valve closed, with the float in its lowest position such as when the receptacle is empty.

Fig. 2 is a corresponding section with the float raised, the suction valve being shown closed and the aha-valve 0 en.

Fig. 3 represents a horizontal section on illustrate modified forms of flap valve 7 preferably having an annular upstanding flange or rib 8 upon its inner face which seats itself upon the opposed flat face of the outlet'end of the said branca 3. This formatlon of the valve prevents parholes of dirt or solid matter from interfering with the working.

. In the top cover 9 is a suction aperture 10 communicatingwith the engine induction pipe or other source of suction, and an air inlet 11.

The suction aperture 10 is controlled by a valve carried by a stem 18, said valve being of two diameters comprising a flat circular part or collar 1:2 of larger diameter than the aperture 10, and a'cylindrical part 13 of ap pronimately the same diameter as the said suction aperture, this part 13 being adapted to enter the aperture as shown in. Fig, 2, while the larger part 19 seats itself against the edge of a recess or enlargement l t at the lower end of the aperture 10. The part 13 of the valve carries a stem 15 terminating in a spherical guide head 16 grooved at 17 to provide for the free passage of the air which is being exhausted from the receptacle. The air inlet 11 is controlled by a cylindrical valve 19 carried by the upper end of a stem 20 and having a conical lower end resting on a seating formed at the bottom of a cylindrical pocket or recess 21 in which the valve moves.

The stems 18, 20, of the suction and air valves respectively, are attached, by balland-socket joints 22, 23,, to a substantially horizontal level 24 composed of two side plates embracing the ball ends of the stems between them. The lever is pivoted at one end to a bracket or hanger 25 depending from the cover 9, and is jointed at the opposite end to asuspended guide rod 26 upon w ieh the controlling float 27 can rise and fall. Near the upper end of this rod 26 is a stop 28 and an adjustable stop pin 29 is provided near the lower end of the rod, which latter passes through a guide member 30 into the interior of the discharge branch 3. The guide member 30 is in the form of a hollow cap or cage slotted at 31 for the passage of the fuel to the branch 3. By the above arrangement the float has an idle movement between the stops on the rod.

The operation of the device is as follows- The parts being in the position shown in Fig. 1, the suction of the engine exhausts the air from the receptacle 1, causing fuel t0. enter at 2. As the float 27 rises it engages the stop 28vand lifts the lever 24, causing first the smaller diameter 13 of the suction valve to enter the aperture 10 so as partially to cut oil? the suction, and finally the larger diameter .12 is closed on to its seating as in Fig. 2. During this time the air valve 19 is being lifted by the lever-24, but it maintains the aperture 11 closed until it leaves the pocket 21. as the suction valve closes, when it opens quickly in order to arrest the filling of the receptacle. .The fuel; is then dis charged into the chamber l and the float 27' descends on the guide rod, the suction valve 12 being held on its seating by the atmosplieric pressureexisting in the receptacle, the air valve being also held open owing to being connected to the same arm as the suc-' tion valve.-

When the fuel has descended to a predetermined level the float 27 in? inges a ainst the stop 29 near the bottom oi the guide rod 26 and lowers the latter, thus positively opening the suction valve and closing the'air valve, as in Fig. 1, so that the receptacleis again filled with fuel.

Instead of the float 27 being. slidaoly 4 mounted on the guide rod 26 thenecessary idle or lost motion may be provided for by fining the float to the rod as in Fig. land providing the latter with a cross-pin 32 at its'upper end working in slots 33 in adepending sleeve 34: which is jointed to'tho end of the valve arm 24 and also to a link 35 pivoted upon the opposite side of the recgptacle tofthc arm 2 l. As the pin 32 reaches t e to 24 is I QSPGOtlVGlY raised and lowered.

Instead of the suction valve cooperating with an /aperture in the top cover of the re s ing on to a seating at the lower end of the illnlOll 39.

If desired the valve lever connected to one arm and the-air valve 19 (which may be of a similar form to the suc.

tion valve) to the other arm, the seating of the air valve being reversed so that the said valve will open when the suctioi valve closes. The lever 2a could be operated by a link 40 connected to a pin 32 on the float guide rod 26, said pin working in slots 41 in the hanger 25.

In the further modification represented in Fig. 7, the air valve may be carried upon the same spindle as the suction valve, said air valve being in the form of a cylinder 19 i 24: may, as shown in Fig. 6, be pivoted at the center to a hanger 25, the suction valve 12, 13, being sliding within an enlarged chamber 4-2 in the suction conduit and having a passage 43 whose opposite ends coiiperate with ports or passages 44, 45 leading to the atmosphere and to the receptacle respectively. The said valve 19 has a longitudinal channel 46 and is connected to the suction valve 12, 13, by a stem e7. -When the suction valve is fully closed, as shown in the drawing, the 43 in the air valve places the port 44: eadin to the atmosphere in'coimnunication wit the passage 4.5 leading to the receptacle, but at all other positions of thevalve the air pagsages are closed.

Although the-use of a valve for controlling the admission of air has been described,

it 15 possible to,clispense with a valve by what ll desire to claim and secure by Letters Patent is and bottom of the slots the valve arm ceptacle, as in Figs. 1 to 4, it may, (as indi:

cated in Fig. 5), upon the upper side of the. cover 9, said chamber communicating with the interior of the receptacle by means of the passage 37. The valve is arrangedito cooperate with the passage 38 in the suction-pipe union or coupling 39 which is screwed into the upper end ofsaid chamber 36, the smaller diameter 13 of the valve entering said passage 38 in the union. and the larger diameter 12 close located in a chamber 36 1. A fuel-supply apparatus for internal combustion engines comprising a low-level reservoir, an auxiliary receptacle communicating with the low-level reservoir and having an air aperture, a source of suction, a conduit from. the source of suction to the receptacle, a suction valve controlling communication between the rece tacle and the source of suction, and adapts to be retained ,on its seating during the emptying of the receptacle solely by'atmospheric pressure, a lever-connected to the suction valve,'a float Within the receptacle, aj lost-motion connection between the float and the suction valve, a cylindrical chamber communicating with the air aperture, and an air-controlling valve slfiable in said chamber, said valve being connected to the suction valve lever and opening the air aperture to the atmosphere only upon the closing of the suction valve.

passage 2. A fuel-supply apparatus for internal eating with the low-level reservoir and ham-- ing an air aperture, 21 source of suction, a

conduit from the source of suction to the receptacle, asuction valve controlling com.- munication between the receptacle and the source of uction, and comprising a plate or collar of larger diameter than the aperture of the suction conduit and a part of smaller diameter which enters the said aperture in advance of the part of larger diameter closing on to its seating, a lever connected to the suction valve, a float-within the receptacle, a lost-motion connection between the float and the suction-valve, a cylindrical chamber communicating With the air aperture, a float within the receptacle, a lost-motion connec- 15 tion between the float and the valve lever, and an air-controlling valve slidable in said ehan'iber, said valve being connected to the suction valve lever and opening the air aperture to the atmosphere only upon the closing 20 or" the suction valve.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

C. F. L. KING. 'Wi tnesses H O. PRATT,

N SKERKETT, 

